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Zhijiang avatarZhijiang

[FLINK-16712][task] Refactor StreamTask to construct final fields

At the moment there are four fields initialized in the method of StreamTask#beforeInvoke, such as `stateBackend`, `checkpointStorage`, `timerService`, `asyncOperationsThreadPool`.

In general it is suggested to use final fields to get known benefits. So we can refactor the StreamTask to initialize these fields in the constructor instead.

This closes #11486

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